added module core-upgrader to upgrade from 1.1.X to 1.2.X

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_2_X@1617488 13f79535-47bb-0310-9956-ffa450edef68
removed upgrader logger, changed upgrade log to info to have complete log during upgrade phase

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_2_X@1617495 13f79535-47bb-0310-9956-ffa450edef68
merge from branch 1_2_X

git-svn-id: https://svn.apache.org/repos/asf/syncope/trunk@1617506 13f79535-47bb-0310-9956-ffa450edef68